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<?php function filterLabel($label) { $filtered = trim($label); $array = array($filtered => 1); $filtered = key($array); if ($filtered === false) { throw new UnexpectedValueException('Unable to filter %s', var_export($label, true)); } return $filtered; } $data = array("foo", "0foo", 0, "0", "00", 1, NULL, FALSE, new SimpleXMLElement('<root />')); foreach ($data as $index => $label) { printf("==== %d ====\n", $index); var_dump($label, filterLabel($label)); }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
==== 0 ==== string(3) "foo" string(3) "foo" ==== 1 ==== string(4) "0foo" string(4) "0foo" ==== 2 ==== int(0) int(0) ==== 3 ==== string(1) "0" int(0) ==== 4 ==== string(2) "00" string(2) "00" ==== 5 ==== int(1) int(1) ==== 6 ==== Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /in/TTdCX on line 5 NULL string(0) "" ==== 7 ==== bool(false) string(0) "" ==== 8 ==== object(SimpleXMLElement)#1 (0) { } string(0) ""
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
==== 0 ==== string(3) "foo" string(3) "foo" ==== 1 ==== string(4) "0foo" string(4) "0foo" ==== 2 ==== int(0) int(0) ==== 3 ==== string(1) "0" int(0) ==== 4 ==== string(2) "00" string(2) "00" ==== 5 ==== int(1) int(1) ==== 6 ==== NULL string(0) "" ==== 7 ==== bool(false) string(0) "" ==== 8 ==== object(SimpleXMLElement)#1 (0) { } string(0) ""
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_NEW in /in/TTdCX on line 11
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_NEW in /in/TTdCX on line 11
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/TTdCX on line 11
Process exited with code 255.

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